feat: end-to-end script CRUD + Rhai execution

Brings the MVP feature set online: upload a Rhai script, get an HTTP
endpoint that runs it sandboxed in-process, list/update/delete it, and
have invalid sources rejected at upload time. Verified live through
Caddy with a full lifecycle (`create → list → get → execute → update
→ delete`) plus error paths (syntax error, duplicate name, deleted).

Layout — every concern lands behind the trait seam its layer owns, so
cluster-mode in v1.3+ is a swap of two impls, not a rewrite:

  * shared::ScriptValidator — manager calls into validation without
    a hard dep on executor-core; executor-core impls the trait on
    `Engine`. Pinned in shared so neither crate has to know about
    the other.

  * executor-core::Engine — real Rhai engine: sandbox limits (max
    operations / string size / map size / call depth), disabled
    `print`, blocked `import` (DummyModuleResolver), `log::trace
    /info/warn/error` registered as a static module with shared
    log-capture buffer (no `log::debug` because `debug` is a Rhai
    reserved keyword — `log::trace` covers the same need).

      - `ctx` is pushed as a Scope constant exposing
        execution_id, script_id, script_name, request_id,
        invocation_type, request.{path,headers,body}.

      - Response convention: a Map with `statusCode` is the
        structured shape (`{statusCode, headers?, body}`); any
        other return value is a 200 with the value as the body.

      - Engine::execute is now synchronous (pure compute); the
        async wrapper + wall-clock timeout live in
        LocalExecutorClient, which spawns_blocking and applies a
        300s hard ceiling regardless of per-script config.

      - 10 unit tests cover validate, exec, structured response,
        ctx exposure, log capture, op-budget enforcement, runtime
        errors, blocked imports, JSON round-tripping.

  * manager-core::repo — full sqlx CRUD over the `scripts` table,
    with proper unique-violation handling for duplicate names.
    Embedded migrations via `sqlx::migrate!` (one initial
    `0001_init.sql` for pgcrypto + scripts + execution_logs).

  * manager-core::api — `admin_router` mounts `/scripts` and
    `/scripts/{id}`. Create + Update validate source through the
    injected `ScriptValidator` before persistence. Returns proper
    422/409/404 status codes via `ApiError::IntoResponse`.

  * orchestrator-core::api — `data_plane_router` mounts
    `/execute/{id}`: resolves the script through `ScriptResolver`,
    constructs the `ExecRequest` from headers+body, awaits
    `ExecutorClient::execute(..., timeout)`, translates the
    `ExecResponse` to an axum `Response` with header passthrough.
    Maps `ExecError` variants to 422/504/502/507.

  * picloud all-in-one — opens the pool, runs migrations, builds
    one engine, nests both routers under `/api/admin` and `/api`,
    enables structured JSON tracing and graceful shutdown on
    SIGTERM. Single `PostgresScriptRepository` Arc is shared by
    the admin router (writes) and the resolver (reads).

Other changes:
  * Workspace axum bump 0.7 → 0.8 for the `{id}` path syntax
    matching the route definitions.
  * Workspace clippy: allow `needless_pass_by_value` and
    `boxed_local` to keep API ergonomics over pedantic noise.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -89,13 +89,13 @@ checksum = "f2032f911046de80f0a198e0901378627c33f59ea0ac00e363d481118bd70a53"
 
 [[package]]
 name = "axum"
-version = "0.7.9"
+version = "0.8.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "edca88bc138befd0323b20752846e6587272d3b03b0343c8ea28a6f819e6e71f"
+checksum = "31b698c5f9a010f6573133b09e0de5408834d0c82f8d7475a89fc1867a71cd90"
 dependencies = [
- "async-trait",
  "axum-core",
  "bytes",
+ "form_urlencoded",
  "futures-util",
  "http",
  "http-body",
@@ -108,8 +108,7 @@ dependencies = [
  "mime",
  "percent-encoding",
  "pin-project-lite",
- "rustversion",
- "serde",
+ "serde_core",
  "serde_json",
  "serde_path_to_error",
  "serde_urlencoded",
@@ -123,19 +122,17 @@ dependencies = [
 
 [[package]]
 name = "axum-core"
-version = "0.4.5"
+version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "09f2bd6146b97ae3359fa0cc6d6b376d9539582c7b4220f041a33ec24c226199"
+checksum = "08c78f31d7b1291f7ee735c1c6780ccde7785daae9a9206026862dab7d8792d1"
 dependencies = [
- "async-trait",
  "bytes",
- "futures-util",
+ "futures-core",
  "http",
  "http-body",
  "http-body-util",
  "mime",
  "pin-project-lite",
- "rustversion",
  "sync_wrapper",
  "tower-layer",
  "tower-service",
@@ -1014,9 +1011,9 @@ dependencies = [
 
 [[package]]
 name = "matchit"
-version = "0.7.3"
+version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0e7465ac9959cc2b1404e8e2367b43684a6d13790fe23056cc8c6c5a6b7bcb94"
+checksum = "47e1ffaa40ddd1f3ed91f717a33c8c0ee23fff369e3aa8772b9605cc1d22f4c3"
 
 [[package]]
 name = "md-5"
@@ -1196,6 +1193,7 @@ name = "picloud"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "async-trait",
  "axum",
  "figment",
  "picloud-executor-core",
@@ -1204,6 +1202,7 @@ dependencies = [
  "picloud-shared",
  "serde",
  "serde_json",
+ "sqlx",
  "thiserror 1.0.69",
  "tokio",
  "tower",
@@ -1255,6 +1254,7 @@ name = "picloud-manager-core"
 version = "0.1.0"
 dependencies = [
  "async-trait",
+ "axum",
  "chrono",
  "picloud-orchestrator-core",
  "picloud-shared",
@@ -1283,6 +1283,7 @@ name = "picloud-orchestrator-core"
 version = "0.1.0"
 dependencies = [
  "async-trait",
+ "axum",
  "chrono",
  "picloud-executor-core",
  "picloud-shared",
@@ -1290,6 +1291,7 @@ dependencies = [
  "serde",
  "serde_json",
  "thiserror 1.0.69",
+ "tokio",
  "tracing",
  "uuid",
 ]